Select the "Customize" option, and choose the "Unlock Clothing" selection. Then, enter one of the following codes to unlock the corresponding item:

Result

Code

???

SPACETIME

Billy from "I Get This Call Every Day"

NOTURBUDDY

Body Paints

PAINTMENOW

Charlie Murder

PUNKRAWK

DLC Quest

HORSEARMOR

Jesse Cox and Josh Mattingly

GREENLIGHT

JSmith OTI

JSMITHOTI

Massive clothing pack

NOTNAKED

Moss from "The Yawhg"

YAWHG

Qwop Runner

QWOPERATOR

Starseed Pilgrim

STARSEED

Super Crate Box

DISCGUN

The Clown Wanted Everything

CLOWN

Steam achievements

Successfully complete the indicated task to unlock the corresponding achievement. To view your achievements and stats in Steam, select "Community", "My profile", "View all my games", then the game and view stats.

A Straight Shooter: Make a tower 70 feet high in Basic Climb without climbers taking up more than 7 feet of the field's width.